Zoning type of a plagioclase in the volcanic rocks from the Myoko and Yakeyama volcanoes, Niigata Prefecture, Japan

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概要

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• The volcanic rocks of the Myoko and Yakeyama in Quaternary are distributed in the Nishikubiki region, Niigata Prefecture. In the Myoko volcano, pyroxene and hornblende andesites are common, and basalt is accompanied in subordinate amount. The volcanic rocks from the Yakeyama are pyroxene - hornblende andesite and hornblende dacite. The zoning types of plagioclase from these volcanic rocks are diverse. It is possible to be classified six types such as fresh, small dusty and big dusty zones at marginal or core parts, sieve-like and fingerprint-like textures. The major zoning type of plagioclase in andesite and dacite from the Yakeyama and Myoko volcanoes at the late stages are fresh type with normal zoning. The chemical variations of major and trace elements of the fresh plagioclase bearing volcanic rocks are plotted far distance from the differentiation trend. The plots of andesites with the various zoning types of plagioclase from the Myoko volcano are a wide dispersion in FeO/MgO-Si0_2 diagram.

• 上越教育大学の論文

著者

• Oba Takanobu

  Division Of Mathematics And Science : Depertment Of Geosciences

• Oba Takanobu

  Division Of Science : Department Of Geoscience Joetsu University Of Education

• Hayatsu Kenji

  Myoko Volcano Research Lavoratory

• Hayatsu K

  Myoko Volcano Research Lavoratory

関連論文

• Zoning type of a plagioclase in the volcanic rocks from the Myoko and Yakeyama volcanoes, Niigata Prefecture, Japan
• Note on rock-forming minerals in the Joetsu district, Niigata Prefecture,Japan. (14) Hornblende in the volcanic rocks from the Yoneyama and Myoko volcanos
• Chemistry of chromian spinel in picrite sill from Ogi, Sado island, Niigata Prefecture, Japan
• Note on rock-forming minerals (1) Chemical compositions of Ca-amplibole in the late Tertiary volcanic rocks from the joetsu district

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